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THE ROLE OF BACTERIAL SYMBIONTS IN amino ACID COMPOSITION OF BLACK BEAN APHIDS

Entomologia Sinica 2003年第3期10卷 167-171页

作者： MingGan De-ChengDing Xue-xiaMiao Institute of Plant Physiology & Ecology Shanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai200032

To evaluate the role of bacterial symbionts ( Buchnera spp. ) in the black bean aphids ( Aphis craccivora Koch), the aphids were treated with the antibiotic, rifampicin, to eliminate their intracellular symbiotic bacteria. Analysis of protein and amino acid concentration in 7-day-old of aposymbiotic aphids showed that the total protein content per mg fresh weight was significantly reduced by 29 %, but free amino acid titers were increased by 17% . The ratio of the essential amino acids.was in general only around 20% essential amino acids.in phloem sap of broad bean, whereas it was 44% and 37% in symbiotic and aposymbiotic aphids, respectively,suggesting that the composition of the free amino acids.was unbalanced. For example, the essential amino acid,threonine represented 21. 6% of essential amino acids.in symbiotic aphids, but it was only 16.7% in aposymbiotic aphids. Likewise, two nonessential amino acids. tyrosine and serine, represented 8.9% and 5.6% of total amino acids.in symbiontic aphids, respectively, but they enhanced to 21.1% and 13.6% in aposymbiotic aphids. It seems likely that the elevated free amino acid concentration in aposymbiotic aphids was caused by the limited protein anabolism as the result of the unbalanced amino acid composition.

关键词： Aphis craccivora aposymbiosis amino acids.

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Synthesis of a Novel Type of Glycophosphate Mimics

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Chinese Chemical Letters 2002年第4期13卷 294-295页

作者： QiangXiao YongJU 等 TheKeyLaboratoryofBioorganicPhosphorusChemistry MinistryofEducationDepartmentofChemistrySchoolofLifeSciencesandEngineeringTsinghuaUniversityBeijing100084 TheKeyLaboratoryofBioorganicPhosphorusChem

A series of novel type of glycophosphate mimics are synthesized by Todd reaction and their structure were determined on the basis of NMR, ESI-MS.

关键词： Glycoconjugate phosphate H-phosphonate amino acids.

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Effect of Boron Foliar Application on Yield and Quality of Some Sunflower （Helianthus annuus L.） Cultivars

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Journal of Agricultural Science and Technology(B) 2015年第5期5卷 309-316页

作者： Bahaa El-Din Mekki Field Crops Research Department National Research Centre P.O. BOX 12622 Dokki Giza Egypt

This study was carried out in the greenhouse of the National Research Center, Dokki, Giza, Egypt, in order to investigate the effect of foliar application of boron （0, 300 and 600 ppm B） as boric acid （H3BO3, 17% B） on the yield and yield components and also the seed quality of two sunflower cultivars （Sakha-53 and Giza-102）. B application at a rate of 600 ppm produced the highest values of seed yield/plant （g）, head diameter （cm）, number of seeds/head, weight of 1,000 seed （g）, percentage of oil （%） and oil yield/plant （g） of both cultivars. Seed yield/plant increased by 26.85% and 34.81% with increasing B concentration from 300 ppm and 600 ppm as compared to control plants, respectively. The results indicated that application of 300 ppm B resulted in an increase of palmitic, stearic and oleic acids.as compared to the treatment with 600 ppm B and control plants. However, the linoleic acid increased gradually with increasing B up to 600 ppm. Such increases were estimated by 8.72% and 7.19% over the control plants or the treatment sprayed with 300 ppm B, respectively. The highest oleic and linoleic acids.percentages （52.71% and 36.05%, respectively） were obtained from Sakha-53 cultivar with 300 ppm B foliar application, while the lowest lenolenic acid percentage （2.01%） was obtained at 600 ppm B. The highest content of gluatmine, isoleucine and arginine （9.61, 3.97 and 3.97 mg/100 g dry weight） was obtained from Sakha-53 cultivar, followed by Giza-102 at a rate of 600 ppm foliar application of B. It can be concluded that B plays a vital role for increasing the productivity and quality of sunflower plants, especially when grown under B deficient soil.

关键词： Sunflower B seed yield fatty acids amino acids.

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